I have not located a complete report on the combat performance of the F6F-5 at this time. However a couple of years ago I did a work up of calculations using the Hellcat II data sheet and other reports. The following is what I came up with:

FINAL REPORT ON COMPARATIVE COMBAT EVALUATION TRIALS OF JAPANESE TONY I TYPE 3 FIGHTER

The Ki 61-I was tested against the F6F-5, FM-2, F4U-1D, F4U-4, F7F-3 and F8F-1. The following information comes from that test report dated 26 January 1943.

CLIMB: The F6F has a superior rate of climb at all altitudes.

SPEED: The F6F is faster at all altitudes.

TURNS: The Tony is greatly superior to the F6F in turns at speeds below 180 knots. (The FM-2 has an equal or slightly smaller radius of turn than the Tony I type 3).

ROLLS: The Tony I and F6F are approximately equal at low speeds. The F6F is greatly superior at high speeds.

ACCELERATION: The F6F has the initial advantage.

ZOOM: The F6F is superior.

The following information comes from a report comparing the A6M5 model 52 against the F6F-5, F4U-1D and FM-2. Note: The turns of the FM-2 and Zeke 52 were very similar, with a slight advantage in favor of the Zeke 52. (Sorry, I couldn't help myself).

ZEKE 52 vs F6F-5

CLIMB: The Zeke climbed about 600 fpm. better up to 9,000 ft., advantage fell off gradually until 14,000 ft. where they were about equal. Above 14,000 ft. the F6F held the advantage. The best climbing speeds were: 105 knots. for the Zeke and 130 knots for F6F.

ROLL: Equal at speeds under 200 knots, F6F superior above.

TURN: Zeke greatly superior in slow speed turns at low and medium altitudes, decreasing to about equal at 30,000 ft.

DIVE: Initial dive about equal, after which the F6F was far superior.

VISION: The Zeke was considered to permit better vizion in all respects.

MANEUVERABILITY: The Zeke was far superior at speeds below about 175 knots, diminishing with speed until 200 knots. The F6F had the advantage above 200 knots ( 230 mph ).

SPEED ( I SAVED THIS SPECIFICALLY FOR LAST ): The F6F-5 was much faster than the Zeke 52 at all altitudes. Top speeds attained were 335 mph at 18,000 ft. for the Zeke and 409 mph. at 21,600 ft. for the F6F-5.

Note: The graph that these performance figures were drawn from looks like a typical performance line of a Hellcat using 'military' power, not combat power. The full throttle height in combat power is usually at a much higher altitude than the graph displays.